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Imports System.Data.OracleClient
:
:省略
:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

    '1)変数の宣言
    Dim OraConn As New OracleConnection

    '2)接続文字列の作成
    OraConn.ConnectionString = _
        "user id=SCOTT;" & _
        "password=TIGER;" & _
        "Data Source=OracleServer"

    '3)接続する(Openメソッド)
    OraConn.Open()

End Sub